4.20 LAB: Remove all non alpha characters Write a program that removes all non alpha characters from the given input. Ex: If the input is: -Hello, 1 worlds! the output is: Helloworld 460854.318432 4 qp3ray? LAB ACTIVITY 4.20.1: LAB: Remove all non alpha characters 0 / 10 LabProgram.java Load default template... import java. util. Scanner; public class LabProgram { public static void main(String args) { /* Type your code here